Source : Webster's Revised Unabridged Dictionary (1913)

Infantile paralysis \In"fan*tile pa*ral"y*sis\ (Med.)
   An acute disease, almost exclusively infantile, characterized
   by inflammation of the anterior horns of the gray substance
   of the spinal cord. It is attended with febrile symptoms,
   motor paralysis, and muscular atrophy, often producing
   permanent deformities. Called also {acute anterior
   poliomyelitis}.

Source : WordNet®

infantile paralysis
     n : an acute viral disease marked by inflammation of nerve cells
         of the brain stem and spinal cord [syn: {poliomyelitis},
         {polio}, {acute anterior poliomyelitis}]